Merge remote-tracking branch 'secondlife/release/2024.09-ExtraFPS' into 2024.09-ExtraFPS

1 files changed, 15 insertions, 0 deletions

diff --git a/indra/newview/llfeaturemanager.cpp b/indra/newview/llfeaturemanager.cpp
index 88024b8390..7a99702e27 100644
--- a/indra/newview/llfeaturemanager.cpp
+++ b/indra/newview/llfeaturemanager.cpp
@@ -655,6 +655,21 @@ void LLFeatureManager::applyBaseMasks()
     if (gGLManager.mIsIntel)
     {
         maskFeatures("Intel");
+        if (gGLManager.mGLVersion < 4.59f)
+        {
+            // if we don't have OpenGL 4.6 on intel, set it to OpenGL 3.3
+            // we also want to trigger the GL3 fallbacks on these chipsets
+            // this is expected to be mainly pre-Haswell Intel HD Graphics 4X00 and 5X00.
+            // A lot of these chips claim 4.3 or 4.4 support, but don't seem to work.
+            // https://code.blender.org/2019/04/supported-gpus-in-blender-2-80/
+            // https://docs.blender.org/manual/en/latest/troubleshooting/gpu/windows/intel.html#legacy-intel-hd-4000-5000
+            // https://www.intel.com/content/www/us/en/support/articles/000005524/graphics.html
+            // this will disable things like reflection probes, HDR, FXAA and SMAA
+            gGLManager.mGLVersion = llmin(gGLManager.mGLVersion, 3.33f);
+            // and select GLSL version for OpenGL 3.3
+            gGLManager.mGLSLVersionMajor = 3;
+            gGLManager.mGLSLVersionMinor = 30;
+        }
     }
     if (gGLManager.mIsApple)
     {